Setting default values for a column

Question

Hi,
I have a table having some default values for the columns. I am using a PreparedStatment to insert into this table. For null values I am using setNull(..) method but the default values given for the columns are not inserted for null values.
eg: INSERT INTO TEST VALUES(?,?);
where TEST table contains two columns col1 and col2 with default values 'AA' and 'BB' respectively. My requirement is to make sure that when null values are specified for the columns then the database default should be picked up. using setNull(..) method doesn't help.
Thanks in advance.
Gyan

Answer 1

Default value for a column can be picked up from DatabaseMetaData class.
The below snippet shows that: -
DatabaseMetaData metaData = connection.getMetaData();
ResultSet resultSet = metaData.getColumns(null, null, "TEST", "COL%");
while ( resultSet.next() )
String defaultValue = resultSet.getString("COLUMN_DEF");
String datatype = resultSet.getString("DATA_TYPE");
System.out.println("defaultValue = " + defaultValue);
System.out.println("datatype = " + datatype);
}